Let
Determine values for the constants such that
We compute the derivative,
Since we must have
From the equation on the left, equating like powers of we have,
From the equation on the right, equating like powers of we have,
Since and
we have
.
Since and
we have
.
Since and
we have
.
Finally, since and
we have
.
Putting these all together,
minor error : f is plus 2
I agree
Yes, f should be 2.